Casing spear



Jan. 9, 1923.

e. A. HUMASON ET AL.

CASING SPEAR.

FILED AUG. 16. (920.

JULIUS A BUFZTSCHEL. Amp GRANVILLE. A. HuqAsoM,

INVENTORSE ATTORN'LY.

Patented Jan. 9, T923,

rants GRANVILLE A. HUMASON AND JULIUS A. BURTSCHEL, OF, EOUSTON, TEXAS.

casme srnAiaQ Application filed August is; lean. Serial No.e04,021.

To all whomitmayconcem:

Be it known that we, GRANVILLE A. HUMAsoN and Jumus A. Bunrscnnn, citizens of the United States, residing at Houston, Harris County, Texas, have invented a certain new and useful Improvement in Casing Spears, of which the following is a full, clear, and exact description, such as will en able others skilled in the art to which it appertains to make and use i the same.

Our invention pertains to an improvement in casing spears to be used in fishing operations in well drilling where it becomes for other reason it becomes necessary to withdraw the casing from the well, a casing spear 1s lnserted downwardly inside the casing and with such a tool the casing 1S pulled from the well. The usual difiiculty with fishingtools used in withdrawing casing in this manner is that when they are once gripped upon the casing it is not easy,

I upper end 12 and a similarly lower beveled and is often impossible, to release the tool casing is so anchored or cemented in the well that it can not be withdrawn.

An object of our invention is to provide a casing spear which maybe readily expanded into contact with the pipe in fishing operations, and which, at the same time, may be readily released when it is desired to withdraw the same from the pipe.

Another objectis to provide a releasing means upon a fishingv tool which maybe operatedto release the, tool by. the simple rotation of the mandrel uponwhich the gripping means is mounted.

Referring to the drawings forming a part of this specification and wherein like numerals of reference are applied to like parts through the several views, Fig 1.. is a central longitudinal section through our improved device showing the same fitted within a length of pipe; Fig. 2 isa broken view thereof showing the releasing means in a different position, Fig. 3 is a transverse section takenon the plane 3,3.of Fig. 1; Fig. 4: a side elevation of our releasing collar, and Fig. 5 is a transverse section through a clamping means showing a slightly different embodiment thereof.

In the drawing we have shown a length ofcasing or pipe 1 with our improved fishing tool therein. The said'tool consists of a mandrel 2 having the upper portion thereof tapered upwardly to provide a slightly conical seatB for a clamping collar l 4. The upper end of the mandrel is threaded at 5 for attachment to a drillcollar 6,

acting as a coupling to connect the tool to the drill stem to which it is attached. The

lower end of the coupling 6 is provided with an upwardly tapered recess 7, the purpose of whichwill later appear. I p The lower portion of the mandrel 2 is cylindricalin shape and threaded at 23 to receive'areleasing collar 8 threaded thereon. The mandrel 1s tubular 1n constructlon, havlng a central channel 9 therethrough for the passage of water or. other flushing fluid.

The lower end of the mandrel is threaded interiorly at 10 to receive the shank of a bit. or spear 11, which acts as a guide or agitator when necessary in the introducinfi of the spear into the caslng.

The clamping member a is provided with a central tapered passage therethrough adapted to seat upon the tapered mandrel at 3. It has a beveled end 13,,said ends being adapted to fit within the recesses 7 of the-collar 6, and 1 k ofthe releasing collar 8, respectively. The outer surface of the clamping collar 4 is provided with teeth 15, said teeth being inclined up- Hwardly so as to grip the, pipe only on the tion springs 16., These springs are fiatleaf springs, each being fitted within a shallow recess 17 inthe outer face of the collar, and are secured in said recesses by rivets or screws 18 at one end thereof. The. other 11 end of the spring is free to move longitudinally and is inserted beneath ,aaever-hang ing flange 19to prevent the'same fromwbe ing thrown out of'the recess. "The central portion of the spring. is bowed outwardly" and :Il'LEtYHbB corru gated dongitudirrallyg therew of, so to bear against the pipe, within which it is inserted, in such manner as to prevent rotation of the collar 8 whenthe mandrel is turned. "The springs do not, however, as will be obvious, interfere with lo'the [insertion of the spear downwardly within the;pipe. V f a In the operationofour'devicethe tool is inserted downwardly within the well. and within'the casing 1,which is to. begripped :thereby. When the proper pointj has been reached the spear is jerked upwardly. *This motion will cause theteeth "15rnf the clamping collar 4:170 grip ,againstjthecasing. f The jjfllltllel upward movement of the .tool will draw'the mandrel 2 upwardly within the clamping collar 4 and. serveto expand the such force as'to" grip it firmly, The further upward movement of"the"ifishing tool will; gserve to pull thecasing upwardly alongwith the tool. If it is desired torelease the'clamping collar t from the casingthereafter "the tool is lowered inthe wellfthus forcingithe mandrel downwardl through the clamping 3 collar nntilthe col ar 6 contacts with the upp er beveled end ofthe clampinggcollar. f'lhe mandrel 2 'will"then be rotated within the collar 8. The springstlfiwill serve to ipr re t t r a io .eti'lt lr ea ng se andthe rotation of the mandrelftherein will {serve to fscrewflfthe Tmandrel downwardly within the collar 8, thus I in jeliect 1 drawing jthefcollaraipwarrlly into contact with the lower beveled end '13 "OffthQLQ-Ollar 4. The

40 collar 4 will thus be forced upwardly until the same is gripped between ithe coupling 6 and'the releasing collar 8, asshown'indlig. 2. Thefurther rotation ofthe mandrel will jjthen tend to clamp 'the collar 4 between the 'ybeveled ends 7 and is of the coupling Gand' releasing collar" 8, respectively," and "thus draw the collar" 4, into contracted position,

- releasingit fromthe casin V tool to be withdrawn fronr the :well.

larl4cjas being divided longitudinally into l four sections, The mandrel 2'. is ;iormed'with 'f'fiat, sides 20, having: afdove-ta iled niortise 5 21 "therein; *Ea'ch of the sections of the Ii l mpine ell r SIPIOY With de tailed tenon' 22 fitting withinthe dovetailed f nortise 12; so as to allow ajslidingmovefitment," of the collar; longitudinally of :the

mandrel. [Thesliding oftheeollaruponfthe limahdrel in this fornrwill act,;.as"will be apparent, to draw ;'the collar inwardly. as it moves up'nnd to iio rce it outwardly as it *iwqi dil t nwswa ilrhwe e b ele ii its" "iipper" "end "in fthis modification as the "thereon, a releasing-collar bel0w said clamp V ing collar,meansi,.to':hold said releasing j latter outwardly against the casing with g, and allow "the "InFig. 5 we'haveshownithe clampingcolleasing collar upwardlyso as to "clamp said "an upwardly tapered mandrel, a clamping ,sss,

dove-tailed connections of ithe sections of the clamping collar' hWith the mandrel would-act in itself to draw the said collar gradually into contracted; position without the clamping efi'ect of the releasing collar ,and the coupling 6.

It will be obvious that this type of tool is strong and rugged in construction and posi tive in its action and that itwill be cheap to manufacture and'not liable to get-out of order or fail to operate at-c'riticaltimes. The advantages of suchconstruction will be apparent Withoutfurther description.

KWV'hat we claim asp new and desire'to 'protect by Letters Patent is: v 1.1 In a tool er the character described, a

tapered mandrel, a iclamping collar thereon,

said collar beingsplit longitudinally and provided with upwardly 1 inclined teeth collar against rotation and meanstodraw said releasing collareipwardly to release said clamping c ollarcomprising athreaded oonnection between said mandrel and said clamping collar.

' 2.:111 a tool "ofthe character described, a taperedmandrel, a clamping collar hav- :ing beveled upper and lower'ends thereon,

a couplingabovesaid clampingcollar having a tapered recessfitherein, a releasing collanbelow said clampingcollar threaded unto said mandrel and having a tapered're- 'cess in the upper end "thereof, and means towpreve-nt rotation of said releasing "collar when said mandrel is rotated.

3. In a" tool of the char'acterf described, a tapered mandrel, a ,cla'mpingcollar fitting thereon, said collar -being split longitudinally; and provided with teeth on the outer ,face thereof, athreaded lower end on said mandrel, a releasingcollar fittingon said threaded surface, means 'to' prevent rotation1oi said releasing collar whereby said releasing collarmay be drawn upwardly by therotation or saidmandrel.

f In a tool of the character described, a "tapered mandrel, an expanding collar fittedthereon, a coupling at the upperend of saidrmandrel having tapered recess therein, a releasingcollarbelbw said mandrelhaving a tapered upper recesstherein, tapered upper andlower ends on said expanding collar, and means to draw said reexpanding collar between thesame and said coupling, operable' by'therotation of said mandrel. j

5..-In a tool er the characterdescribed,

collar fitting slidably 'on' said ,jmandrel whereby said collarbe moved downwardly and expanded, a .Hreleasing collar threaded to said mandrel below said relgmping c'ollar; and mea ns -toscrew said releasmg collar upwardly on said 'mandrel against said clamping collar to cause said clamping collar to contract.

6. In a tool of the character described, a mandrel tapering upwardly, a split clamp ing collar thereon adapted to be expanded by the relative upward movement of said mandrel, a threaded portion on the lower end of said mandrel, a releasing collar on 

